Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 11, Pages 7506-7523Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp00037e
Keywords
-
Funding
- National Research Foundation, Prime Minister's Office, Singapore [NRF-CRP 10-2012-6, NRF-CRP 8-2011-4]
- NUS
- Johnson Matthey PLC
- National Research Foundation, Prime Minister's Office, Singapore
Ask authors/readers for more resources
The obvious cost advantage as well as attractive electrochemical properties, including excellent cycling stability and the potential of high rate performance, make sodium-ion batteries prime candidates in the race to technically and commercially enable large-scale electrochemical energy storage. In this work, we apply our bond valence site energy modelling method to further the understanding of rate capabilities of a wide range of potential insertion-type sodium-ion battery cathode materials. We demonstrate how a stretched exponential function permits us to systematically quantify the rate performance, which in turn reveals guidelines for the design of novel sodium-ion battery chemistries suitable for high power, grid-scale applications. Starting from a diffusion relaxation model, we establish a semi-quantitative prediction of the rate-performance of half-cells from the structure of the cathode material that factors in dimensionality of Na+ ion migration pathways, the height of the migration barriers and the crystallite size of the active material. With the help of selected examples, we also illustrate the respective roles of unoccupied low energy sites within the pathway and temperature towards the overall rate capability of insertion-type cathode materials.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available